Wales have plenty of numbers in defence but Sexton still manages to create space by passing to Stander and then receiving the ball back.

If we freeze the play we can see Scott Williams is defending Henshaw (top arrow) and Tipuric in the blue cap is marking Stander (shorter, bottom arrow), who is about to receive the ball.

As Stander takes the ball back in on the angle towards the Welsh midfield defence Tipuric follows him in. This seems logical as Tipuric is keeping an eye on his man and tracking him, but he is unaware that Sexton is going to run around the back of Stander and receive the ball.

Tipuric tackles Stander and Sexton then has a free run to release Zebo in space.

Later in the game, with Ireland pressing the Welsh line Sexton tries it again…and again it works!